From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
To: gregkh@linuxfoundation.org, stern@rowland.harvard.edu,
linux@prisktech.co.nz, robh+dt@kernel.org, mark.rutland@arm.com
Cc: linux-usb@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Subject: [PATCH 0/2] usb: host: ehci-platform: add a quirk to avoid stuck
Date: Fri, 17 Jan 2020 19:54:05 +0900 [thread overview]
Message-ID: <1579258447-28135-1-git-send-email-yoshihiro.shimoda.uh@renesas.com> (raw)
Since EHCI/OHCI controllers on R-Car Gen3 SoCs are possible to
be getting stuck very rarely after a full/low usb device was
disconnected. To detect/recover from such a situation, the controllers
require a special way which poll the EHCI PORTSC register and changes
the OHCI functional state.
So, this patch adds a polling timer into the ehci-platform driver,
and if the ehci driver detects the issue by the EHCI PORTSC register,
the ehci driver removes a companion device (= the OHCI controller)
to change the OHCI functional state to USB Reset once. And then,
the ehci driver adds the companion device again.
Yoshihiro Shimoda (2):
dt-bindings: usb: generic-ehci: add a quirk property to avoid stuck
usb: host: ehci-platform: add a quirk to avoid stuck
.../devicetree/bindings/usb/generic-ehci.yaml | 5 +
drivers/usb/host/ehci-platform.c | 104 +++++++++++++++++++++
2 files changed, 109 insertions(+)
--
2.7.4
next reply other threads:[~2020-01-17 10:54 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-17 10:54 Yoshihiro Shimoda [this message]
2020-01-17 10:54 ` [PATCH 1/2] dt-bindings: usb: generic-ehci: add a quirk property to avoid stuck Yoshihiro Shimoda
2020-01-17 16:03 ` Geert Uytterhoeven
2020-01-20 8:05 ` Yoshihiro Shimoda
2020-01-23 8:17 ` Yoshihiro Shimoda
2020-01-23 8:57 ` Geert Uytterhoeven
2020-01-23 12:06 ` Yoshihiro Shimoda
2020-01-17 10:54 ` [PATCH 2/2] usb: host: ehci-platform: add a quirk " Yoshihiro Shimoda
2020-01-17 16:26 ` Alan Stern
2020-01-20 9:33 ` Yoshihiro Shimoda
2020-01-20 15:12 ` Alan Stern
2020-01-21 1:37 ` Yoshihiro Shimoda
2020-01-21 15:09 ` Alan Stern
2020-01-22 11:05 ` Yoshihiro Shimoda
2020-01-22 14:58 ` Alan Stern
2020-01-23 12:05 ` Yoshihiro Shimoda
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